{"cve":"CVE-2019-11808","nvd":{"published":"2019-05-07T07:29:05.167","modified":"2026-06-17T02:13:39.210","status":"Modified","description":"Ratpack versions before 1.6.1 generate a session ID using a cryptographically weak PRNG in the JDK's ThreadLocalRandom. This means that if an attacker can determine a small window for the server start time and obtain a session ID value, they can theoretically determine the sequence of session IDs.","cvss_v4":null,"cvss_v3":{"version":"3.0","vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","score":3.7},"cwes":["CWE-338"],"references":["https://github.com/ratpack/ratpack/commit/f2b63eb82dd71194319fd3945f5edf29b8f3a42d","https://github.com/ratpack/ratpack/issues/1448","https://github.com/ratpack/ratpack/releases/tag/v1.6.1","https://github.com/ratpack/ratpack/commit/f2b63eb82dd71194319fd3945f5edf29b8f3a42d","https://github.com/ratpack/ratpack/issues/1448"],"products":["ratpack_project:ratpack"],"source":"nvd","synced_at":"2026-10-19T20:56:19.218283075+00:00"},"epss":{"cve":"CVE-2019-11808","score":0.01315,"percentile":0.70753,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-54mg-vgrp-mwx9","url":"https://osv.dev/vulnerability/GHSA-54mg-vgrp-mwx9","summary":"Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) in Ratpack","modified":"2023-11-08T04:01:02.010246Z","packages":[{"ecosystem":"Maven","name":"io.ratpack:ratpack-session","purl":"pkg:maven/io.ratpack/ratpack-session","ranges":["<1.6.1"],"fixed":["1.6.1"]},{"ecosystem":"Maven","name":"io.ratpack:ratpack-java","purl":"pkg:maven/io.ratpack/ratpack-java","ranges":["<1.6.1"],"fixed":["1.6.1"]},{"ecosystem":"Maven","name":"io.ratpack:ratpack-groovy","purl":"pkg:maven/io.ratpack/ratpack-groovy","ranges":["<1.6.1"],"fixed":["1.6.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}